SAT Math Multiple Choice Practice Question 606: Answer and Explanation
20. If and xy = 1, where x and y are greater than zero, what is the value of y?
Correct Answer: A
A Start with the second equation, xy = 1. The only way for this to equal 1 would be if y = 0 or x = 1. The problem states that x and y are both greater than zero, which means that it must be that x = 1. Plugging that into the first equation gives us , so = 1, and y = 2.